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Originally Posted by Anthony
That is impressive.
I heard of someone sticking a needle into a vacuum/boost line to somehow trick the system into giving alot more boost, i.e. power. I think it was a turbo RX7 or Eclipse or something like that.
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Very good Anthony, yes this is one simple way to accomplish more boost on a turbocharged car..
I have a friend with a VERY fast SVO Mustang (remember those; 1984-1/2 to1986 I think? 2.3L turbo 4 banger; factory rated at about 175-205HP depending on the model year). On the vacuum line that tells the computer when the factory set "overboost" is achieved, you can put a small "leak" in the line so that the turbo will continue to "boost" for a while longer...
Now, this has to be done VERY CAREFULLY and a bit of math must be done to figure out how much of a "leak" you want to induce to get you to the max. boost that you want. My friend cut the rubber overboost line (was about a 1/4" I.D. line if memory serves me) and put a small section of metal tubing in the middle so that he could get an accurate "hole size" for the proper amount of leakage. It was a VERY small hole (like .020"). But, this gave him enough of a leak to go from the factory max. boost of about 12psi, up to about 18psi (reports are that the Griffiths(?) turbo units in these cars could reliably deliver @30psi boost, but that the motor's bottom end wouldn't survive very long at these levels without some serious mods.).
Overall, this light little 4 cylinder SVO was spanking a LOT of V8 cars on the street!!! Those SVOs handled VERY well too, they had adjustable Koni shock on all 4 corners... What a little go-kart!
Pat